Hama 00087699 is a pulse computer that can be used to monitor your heart rate during exercise. It features a large LCD display that shows your current heart rate, the percentage of your maximum heart rate, and the time. You can also set target heart rate zones and the device will alert you if you go above or below these zones. The computer is water-resistant and can be worn on your wrist or mounted to your bike handlebars. It also includes a calorie counter and a stopwatch.